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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A221120 Number of n X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor.

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%I A221120 #7 Jul 23 2025 01:44:10
%S A221120 1,21,4872,16436223,723234356389,429398881440049645
%N A221120 Number of n X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor.
%C A221120 Diagonal of A221125
%e A221120 Some solutions for n=3
%e A221120 ..1..0..1....1..1..3....2..0..0....1..1..0....0..3..0....1..0..3....2..0..1
%e A221120 ..0..2..1....0..1..0....1..4..0....1..1..3....1..0..2....0..2..1....0..4..0
%e A221120 ..3..0..1....1..1..1....0..0..2....1..1..0....0..1..2....0..2..0....0..0..2
%K A221120 nonn
%O A221120 1,2
%A A221120 _R. H. Hardin_ Jan 02 2013

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